http://www.stud.uni-karlsruhe.de/~uvaue/chaos/

Wolf4SDL is an open-source port of id Software's classic first-person shooter Wolfenstein 3D to the cross-plattform multimedia l […]
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Wolf4SDL is an open-source port of id Software's classic first-person shooter
Wolfenstein 3D to the cross-plattform multimedia library "Simple DirectMedia
Layer (SDL)" (http://www.libsdl.org). It is meant to keep the original feel
while taking advantage of some improvements mentioned in the list below.

Main features:

- Cross-platform:
Supported operating systems are at least:
- Windows 98, Windows ME, Windows 2000, Windows XP, Windows Vista
(32 and 64 bit)
- Linux
- BSD variants
- KallistiOS (used for Dreamcast)
Only little endian platforms like x86, ARM and SH-4 are supported, yet.

- AdLib sounds and music:
This port includes the OPL2 emulator from MAME, so you can not only
hear the AdLib sounds but also music without any AdLib-compatible
soundcard in near to perfect quality!

- Multichannel digitized sounds:
Digitized sounds play on 8 channels! So in a fire fight you will
always hear, when a guard opens the door behind you 😉

- Higher screen resolutions:
Aside from the original 320x200 resolution, Wolf4SDL currently
supports any resolutions being multiples of 320x200 or 320x240,
the default being 640x400.
Unlike some other ports, Wolf4SDL does NOT apply any bilinear
or similar filtering, so the graphics are NOT blurred but
pixelated just as we love it.

- Fully playable with only a game controller:
Wolf4SDL can be played completely without a keyboard. At least two
buttons are required (shoot/YES and open door/NO), but five or more
are recommended (run, strafe, ESC).